Azodyestuffs and process of making same



Patented Apr. 23, 1929.

UNITED STATES PATENT OFFICE.

LEOPOLD LASKA, FRIEDRICH KREOKE, AND FRITZ WEBER, F OFFENBAOH-OINf-THE- MAIN, GERMANY, ASSIGNORS TO GRASSELLI DYESTUFF CORPORATION, OF NEW YORK, N. Y., A. CORPORATION OF DELAWARE v .AZODYESTUFFS AND PROCESS OF MAKING SAME.

Ho Drawing. Application filed September 29, 1927,

Our invention relates to new azo'dyestuii's corresponding in form of free acids probably to thegeneral formula:

wherein aryl means a residue of the benzene w series, which may be obtained by combining aromatic diazocompounds with 2.6-naphtho carboxylic acid. The new dyestuffs are when red to brown powders soluble in concentrated sulfuric acid with a reddish color,

yielding upon reduction with stannous chloride l-amino-Q-hydroxy-naphthalene-(i-carboxylic acid and an arylamino compound.

They dye wool yellowish red to brown tints,

turnin to blue to violet to black'shades when after-c romed, the dye cotton reddish to v tioned t erein.

Example 1.93 parts of aniline are diazotized'in the usual manner. The diazo solution thus obtained -is allowed to" run in into an ueous solution of 210 arts of the sodium s t of 2.6-naphthol car xylic acid with addition of such an amount of sodium acetate as necessary for neutralizing the free mineral acid. At the end of the combination the solution is made alkaline and the dyestufi 40 is separated by adding common salt. The new' dyestufi m form of free acid having probably the formula:

- dyes wool yellowish red shades, more yellow than the correspondin combination with 2.3-

hydroxynaphthoic acid and surlplassingr it as to tmctorial power and solub 'ty. he

Serial No. 222,934, and in German October 5, 192a.

combination may also be carried out in alkaline solutions.

' Ewample 2.-A diazo solution, prepared in the usual manner from 207,5 parts of parachloroaniline-nrtho-sulfonic acid, is mixed with an aqueous solution of 210 parts of the sodium salt of 2.6-naphthol carboxylic acid,

containing an amount of sodium acetate suflicient for neutralizing the free mineralacid. For finishing the combination the'solution is made alkaline with carbonate of soda and the dyestuif separated b addin common salt. The new dyestufi' in orm of ree acid having probably the formula:

dyes wool yellowish red shades, more bluish and fuller than those of the corresponding dyestufi' derived from 2.6-naphthol sulfonic acid. The solubility of the 'dyestuif is better than of. the corresponding combination with 2.3-naphthol-carboxylic'acid.

Example 3.-154 parts of ara-nitroortho-aminophenol are diazotized 1n the usual manner and the diazo solution thus obtained combined with an aqueous solution of 210 parts of the sodium salt-of 2.6-naphthol carboxylic acid, containing such an amount of carbonate of soda, that after addition of the mineral acid diazo solution the li nor is alkaline with bicarbonate. When t e combination is complete the dyestufl' is salted out. The new dyestufl' in form of free acid having probably the formula:

dyes wool brown, when dyed with addition of ammonium chromate, black-brown; shades. The dyeings are fuller than those of the correspondingdyestufis derived from 2.3-naphthol carboxylic acid and 2.6-na htholsulfonic acid. The solubility is good tter than of thecombination with 2.3-hydroxynaphthoic aci of the sodium salt of 2.6-naphthol carboxylic acid. When the combination is complete, the dyestuif in form of free acid, having probably the formula:

HO N0:

03 SOaH is separated by adding salt to the solution.

'. It dyes wool 1n acid solution Violet shades,

when after chromed, fuller than those of the corresponding combination with 2.6-naphthol sulfonic acid. The solubility of the dye- .stufit' is better than of the dyestufi, ilerived 15 from 2.3-na-phthol carboxylic acid.

In the following table some further dyestuffs, derived from 2.6-naphthol carboxylic acid, are named.

Diazocompound oi- Dyed material 1 Shades Picmminic Qflfl Wool, aiterchromed Brownish black.

1.2-aminonaphthol-4-su1fonic acid Do. v Dark blue. Pera-chloroortho-am.ino-phenol-ortho-suli0n1c acid- Do. Violet. Para-nitro-ortho-amino-salicylic arid Do. Reddish brown. 0rtho-aminophenoi-para-sulfonic acid Do, Violet. 2-11ydtoxy-3-carboxy-S-sulfobenzene-azo'anaphthylamme of the formula: Do. Dark violet.

H 0 O C 0 H NH: 6.8 disulfonaphthaleneii-azo-a-naphthylamine oi the formula: Wool in acid solution Dark violet.

SOaH N=N I HOaS (p I NH: Tetra-azocompound of benzidine-meta-disullonic acid (combined with two equivalents of 2.6-naphtholcarboxylic acid) Cotton, chrome printing Reddish brown. Tetra-azocompound of ortho-tolidine-meta-disulfonic!acid (combined with two equivalents of 2.6-naphtho1carboxylic acid) Do. Reddish brown. Tetra-azocompound oi meta-dichlorobenzidine-disulfonic acid (combined with two equivalents of 2.6-naphtholcarboxylic acid) Do. Reddiah brown. 2.1-naphthylamine sulfonie cid Wool in acid solution Red. Ortho-toluidine-meta-sulfonic acid of the formula: Do. Red.

NH: Acetylara-phenylene diaminesulfonio acid Do. Red. Para-to uidlne-meta-sulfonio acid of the formula: Bariumand calcium-lake Red.

HaN OH:

02H Aniline-ortho-suilonic ci Do. Red- We claim: series, which are when dry red to brown pow- 1. As new products the azodyestufis corresponding in form of free acids probably to the general formula:

wherein aryl means a residue of the benzene 'ders soluble in concentrated sulfuric acid with a reddish color, yielding upon reduc tion with stannous chloride l-amino-Q-hydroxynaphthalene-6-carboxylic acid and an arylaminocompound of the benzene series, dyeing wool yellowish red to brown tints, turning to blue to violet to black shades when afterchromed, dyeing cotton reddish to brownish shades by the chromeprinting procthe formula:

being when dry a reddish 'powder, yielding v on reduction with stannous chloride l-amino- 2-hydroxynaphthalene-6-carbozrylic acid and para-ch1oroaniline-ortho-sulfomc acid, dye- 15 ing wool yellowish red shadw.

3. A fibrous material dyed with the dyestufis claimed in claim 1.

4. A fibrous material dyed with the dye- &

stuff claimed in claim 2.

In testimony whereof, we aflix our signatures.

LEOPOLD LASKAL FRIEDRICH KRECKE. FRITZ WEBER. 

